<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>Title</title>
</head>
<body>
<p style="background-color: #327cd1">asdasf</p>
<form action="demo-form.php">
    生日：<input type="date" name="bday">
        <input type="submit">
</form>
</body>
</html>